base.lisp

   1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10; Package: modlisp -*-
   2 ;;;; *************************************************************************
   3 ;;;; FILE IDENTIFICATION
   4 ;;;;
   5 ;;;; Name:          base.lisp
   6 ;;;; Purpose:       Utility functions for modlisp package
   7 ;;;; Programmer:    Kevin M. Rosenberg
   8 ;;;; Date Started:  Dec 2002
   9 ;;;;
  10 ;;;; $Id: base.lisp,v 1.2 2003/07/04 22:41:06 kevin Exp $
  11 ;;;; *************************************************************************
  12
  13 (in-package #:modlisp)
  14
  15
  16 (let ((*listener-socket* nil)
  17       (*listener-process* nil))
  18
  19   (defun modlisp-start (&key (port +default-apache-port+)
  20                              (function 'demo-apache-command-processor))
  21     (handler-case
  22         (make-socket-server (next-server-name) function port
  23                             :format :text :wait nil)
  24       (error (e)
  25         (format t "Error ~A" e)
  26         (decf *listener-count*)
  27         nil)
  28       (:no-error (process socket)
  29         (setq *listener-socket* socket)
  30         (setq *listener-process* process)
  31         process)))
  32
  33   (defun modlisp-stop ()
  34     (when *listener-process*
  35       (format t "~&; killing process ~d~%" *listener-process*)
  36       #+sbcl (sb-thread:destory-thread *listener-process*)
  37       #+allegro (mp:process-kill *listener-process*)
  38       #+allegro (mp:process-allow-schedule)
  39       #+lispworks (mp:process-kill *listener-process*)
  40       #+cmucl (mp:destroy process *listener-process*)
  41       (setq *listener-process* nil))
  42     (when *listener-socket*
  43       (ignore-errors (close *listener-socket*))
  44       (setq *listener-socket* nil)))
  45
  46  )
  47
  48 (defun next-server-name ()
  49   (format nil "modlisp-socket-server-~d" (incf *listener-count*)))
  50
  51 (defun next-worker-name ()
  52   (format nil "modlisp-worker-~d" (incf *worker-count*)))
  53
  54
  55 (defun apache-command-issuer (*apache-socket* processor-fun)
  56   "generates commands from apache, issues commands to processor-fun"
  57   (let ((*close-apache-socket* t))
  58     (unwind-protect
  59         (loop for *apache-nb-use-socket* from 0
  60             for command = (get-apache-command)
  61             while command
  62             do (funcall processor-fun command)
  63               (force-output *apache-socket*)
  64             until *close-apache-socket*)
  65       (close *apache-socket*))))
  66
  67 (defun get-apache-command ()
  68   (ignore-errors
  69    (let* ((header (loop for key = (read-line *apache-socket* nil nil)
  70                         while (and key
  71                                    (string-not-equal key "end")
  72                                    (> (length key) 1))
  73                       for value = (read-line *apache-socket* nil nil)
  74                       collect (cons key value)))
  75           (content-length (cdr (assoc "content-length" header :test #'equal)))
  76           (content (when content-length
  77                      (make-string
  78                       (parse-integer content-length :junk-allowed t)))))
  79      (when content
  80        (read-sequence content *apache-socket*)
  81        (push (cons "posted-content" content) header))
  82      header)))
  83
  84 (defun write-header-line (key value)
  85   (write-string key *apache-socket*)
  86   (write-char #\NewLine *apache-socket*)
  87   (write-string value *apache-socket*)
  88   (write-char #\NewLine *apache-socket*))
  89
  90 (defun header-value (command key)
  91   (cdr (assoc key command :test #'string=)))
  92
  93
  94 ;;; Default (demo) processor
  95
  96 (defun demo-apache-command-processor (command)
  97   "Sample function to process an apache command"
  98   (if (equal (header-value command "url") "/asp/fixed")
  99       (fixed-request)
 100       (debug-request command)))
 101
 102 (defun fixed-request ()
 103   (let ((html (fixed-html)))
 104     (write-header-line "Status" "200 OK")
 105     (write-header-line "Content-Type" "text/html")
 106     (write-header-line "Content-Length" (format nil "~d" (length html)))
 107     (write-header-line "Keep-Socket" "1")
 108     (write-string "end" *apache-socket*)
 109     (write-char #\NewLine *apache-socket*)
 110     (write-string html *apache-socket*)
 111     (setq *close-apache-socket* nil))  )
 112
 113 (defun debug-request (command)
 114   (let ((html (debug-table command)))
 115     (write-header-line "Status" "200 OK")
 116     (write-header-line "Content-Type" "text/html")
 117     (write-header-line "Keep-Socket" "0")
 118     (write-string "end" *apache-socket*)
 119     (write-char #\NewLine *apache-socket*)
 120     (write-string html *apache-socket*)
 121     (setq *close-apache-socket* t))  )
 122
 123 (defun debug-table (command)
 124   (with-output-to-string (s)
 125    (write-string "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML//EN\">
 126 <html><head></head>
 127 <body>
 128 <table><tbody>
 129 <tr><t colspan=\"2\">mod_lisp debug</th></tr>
 130 <tr><th>Key</th><th>Value</th></tr>" s)
 131    (format s "<TR bgcolor=\"#F0F0c0\"><TD>apache-nb-use-socket</TD><TD>~a</TD></TR>"  *apache-nb-use-socket*)
 132    (loop for (key . value) in command do
 133          (format s "<tr><td>~a</td><td>~a</td></tr>" key value))
 134    (write-string "</tbody></table></body></html>" s)))
 135
 136 (defun fixed-html ()
 137   "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML//EN\">
 138 <html><head></head><body><h1>mod_lisp</h1>
 139 <p>This is a constant html string sent by mod_lisp</p></body></html>")